You can't specify a time, but there are several options: 9-10 am and 7 pm. I originally bought it to guarantee entry to the Nintendo park, and on the day I went, I could enter the park freely. However, the Speedpass is very convenient, saving a lot of queuing time, especially the Donkey Kong. I highly recommend it. If I go again, I will definitely buy more rides; it's well worth it.